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1. IN A COMMUNICATION SYSTEM, A PLURALITY OF ORIGINATING UNITS OF A FIRST CLASS, A PLURALITY OF ORIGINATING UNITS OF A SECOND CLASS, A PLURALITY OF RECEIVING UNITS OF A FIRST CLASS, A PLURALITY OF RECEIVING UNITS OF A SECOND CLASS, A LINK FOR SELECTIVELY PROVIDING ACCESS FROM SAID ORIGINATING UNITS OF THE FIRST CLASS TO SAID RECEIVING UNITS OF THE FIRST CLASS AND FROM SAID ORIGINATING UNITS OF THE SECOND CLASS TO SAID RECEIVING UNITS OF THE FIRST CLASS ARE ENEFFECTIVE WHEN ALL RECEIVING UNITS OF THE FIRST CLASS ARE ENGAGED FOR EFFECTING A CONNECTION BETWEEN AN ORIGINATING UNIT OF THE FIRST CLASS AND A RECEIVING UNIT OF THE SECOND CLASS, SAID LINK INCLUDING A FIRST GROUP OF RELAYS ASSOCIATED RESPECTIVELY WITH SAID RECEIVING UNITS OF THE FIRST CLASS AND A SECOND GROUP OF RELAYS ASSOCIATED RESPECTIVELY WITH SAID RECEIVING UNITS OF THE SECOND CLASS, A FIRST COMMON OPERATING PATH FOR SAID FIRST GROUP OF RELAYS, A SECOND COMMON OPERATING PATH FOR SECOND GROUP OF RELAYS, AN AUXILIARY PATH CONNECTING SAID FIRST AND SAID SECOND COMMON OPERATING PATHS, AND MEANS EFFECTIVE FOR CALLS ORIGINATED BY UNITS OF SAID SECOND CLASS FOR RENDERING INEFFECTIVE BOTH SAID FIRST COMMON OPERATING PATH AND SAID AUXILIARY PATH. 